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https://github.com/AuxXxilium/linux_dsm_epyc7002.git
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1337173148
The current implementations of __ndelay and __udelay call a hypervisor service to delay, but the hypervisor service isn't actually implemented very well, and the consensus is that Linux should handle figuring this out natively and not use a hypervisor service. By converting nanoseconds to cycles, and then spinning until the cycle counter reaches the desired cycle, we get several benefits: first, we are sensitive to the actual clock speed; second, we use less power by issuing a slow SPR read once every six cycles while we delay; and third, we properly handle the case of an interrupt by exiting at the target time rather than after some number of cycles. Signed-off-by: Chris Metcalf <cmetcalf@tilera.com> |
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| .. | ||
| asm-offsets.c | ||
| backtrace.c | ||
| compat_signal.c | ||
| compat.c | ||
| early_printk.c | ||
| entry.S | ||
| hardwall.c | ||
| head_32.S | ||
| hvglue.lds | ||
| init_task.c | ||
| intvec_32.S | ||
| irq.c | ||
| machine_kexec.c | ||
| Makefile | ||
| messaging.c | ||
| module.c | ||
| pci-dma.c | ||
| pci.c | ||
| proc.c | ||
| process.c | ||
| ptrace.c | ||
| reboot.c | ||
| regs_32.S | ||
| relocate_kernel.S | ||
| setup.c | ||
| signal.c | ||
| single_step.c | ||
| smp.c | ||
| smpboot.c | ||
| stack.c | ||
| sys.c | ||
| tile-desc_32.c | ||
| time.c | ||
| tlb.c | ||
| traps.c | ||
| vmlinux.lds.S | ||